for me it would be the 1st option, you quoted them the price, so now you should go by that price for the rest of the season and raise it a little next year. raising the price now would be going agaisnt your word and price that YOU gave them....

Yes, I gave them a price, and told them it may change after a mow or 2. How is that going against my word?

Have you ever done the first option? How did it work out for you? Did you lose money the first year, and lose the customer the second year?